Transmission & Drivetrain
Availability
Building awesome horsepower is only part of the story. You need to deliver all that power to your car or truck’s wheels! We’ve got torque-hungry high performance automatic...
Building awesome horsepower is only part of the story. You need to deliver all that power to your car or truck’s wheels! We’ve got torque-hungry high performance automatic and manual transmissions for street and strip applications, torque converters and clutch sets, flexplates and flywheels, plus limited-slip differentials, spools, lockers, ring and pinion sets, driveshafts, U-joints, axles, bearings, C-clip eliminator kits, transfer cases, shift kits, and rebuild kits. We also have a wide selection of trans-brakes, shifters, cables, and accessories—everything you need to put the power to the ground, Summit style.
Building awesome horsepower is only part of the story. You need to deliver all that power to your car or truck’s wheels! We’ve got torque-hungry high performance automatic and manual transmissions for street and strip applications, torque converters and clutch sets, flexplates and flywheels, plus limited-slip differentials, spools, lockers, ring and pinion sets, driveshafts, U-joints, axles, bearings, C-clip eliminator kits, transfer cases, shift kits, and rebuild kits. We also have a wide selection of trans-brakes, shifters, cables, and accessories—everything you need to put the power to the ground, Summit style.
Shift Kit, Zip Kit, Chevy, Kit
Part Number: SOX-6L45-6L90ZIP
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Shift Kit, Automatic Type, GM, 4L80E, 4L85E, Forward/Standard Shift Pattern, Each
Part Number: TRG-4L80E-HD2
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Shift Kit, Automatic Type, Includes .500 in. Boost Valve, GM, 4L60E, Each
Part Number: TRG-4L60E-HD2
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Shift Improver Performance Pack, 4L60E, 4L65E, 4L70E, Buick, Chevy, GMC, Oldsmobile, Pontiac, Kit
Part Number: SOX-HP-4L60E-01
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Automatic Shift Kit, 6L80, 6L80E, 6L90, 6L90E, Cadillac, Chevrolet, GMC, Hummer, Pontiac, Kit
Part Number: TRG-SK6L80
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Shift Kit, Performance, Buick, Chevy, Oldsmobile, Pontiac, GMC, TH350, 1969-81, Kit
Part Number: TRG-350-1-2
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Shift Kit, Performance, Buick, Chevy, Oldsmobile, Pontiac, GMC, TH400, 1965-95, Kit
Part Number: TRG-400-1-2
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Shift Kit, Performance, Gaskets, Pro-Race, Heavy Duty, Super Show Off, Buick, Cadillac, Chevy, GMC, Oldsmobile, Pontiac, TH400, Kit
Part Number: TRG-400-PRO
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Automatic Transmission Valve Body, GM 4L80-E, 4L85-E, Performance, Each
Part Number: SOX-HP-4L80E-01
Not Yet Reviewed
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Automatic Transmission Shift Kits, Reprogramming Kit, Performance/Tow/Haul, GM, 6L45, 6L50, 6L80, 6L90, Kit
Part Number: TRG-6L80-TOW-PRO
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Automatic Transmission Shift Kits, TCC Zip Kit, with O-Ring End Plugs, Converter Limit Valve, Regulator/Shuttle, Cadillac, Chevy, GMC, 8L45, 8L90, Kit
Part Number: SOX-8L458L90TCCZ
Not Yet Reviewed
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Shift Kit, Automatic, Full Manual, GM, 700R4, Towing, Competition, Pro Sreet, Each
Part Number: TRG-700-2-3
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Shift Kit, Shift Improvement, ISO-CON Valve, GM, 4L60E, 4L65E, 4L70E, 4L75E, Each
Part Number: TRG-SK4L60E
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Shift Improver, Chevy, TH350, Each
Part Number: BMM-30262
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Shift Kit, Automatic Type, Chrysler, Torqueflite, 3 Speed, Full Race Shifts, Each
Part Number: TRG-TF-2
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Shift Kit, Automatic Type, Ford, AODE, 4R70W, Towing, Competition, Heavy Duty, Pro-Street, Each
Part Number: TRG-AODE-HD2
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Performance Shift Kit, 4L60E, 4L65E, 4L70E, Kit
Part Number: TRG-4L60E-PRO
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Automatic Transmission Shift Kits, Chrysler, 45RFE, 545RFE, 65RFE, 66RFE, 68RFE, Kit
Part Number: TRG-RFE-5B-HP
Not Yet Reviewed
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Shift Kit, Full Manual, Chrysler, Full Race, Competition, Off Road, Pro Street, Each
Part Number: TRG-TFOD-3
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Shift Kit, Automatic Type, Infiniti, for Nissan, Jatco, 5-Speed, Kit
Part Number: TRG-RE5R05A-HD2
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Shift Kit, Automatic Type, Ford, C-6, Towing, Competition, Heavy Duty, Gas Engines, Each
Part Number: TRG-67-1-2
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Automatic Transmission Shift Kits, Zip Kit, with Boost Valve, O-Ring Plugs, Accumulator Pistons, Spring, Sleeves, Ford, 6R140, Kit
Part Number: SOX-6R140-ZIP
Not Yet Reviewed
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Automatic Transmission Shift Kit, Gaskets, Jeep, Toyota, Kit
Part Number: TRG-340-HD2
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Transmission Upgrade Kit, Shift Improver, GM, TH400, TH375, M40, Each
Part Number: BMM-20260
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Shift Kit, Shift Improvement, without Auxiliary Valve Body, GM, 700R4, 4L60, Each
Part Number: TRG-SK700
Estimated Ship Date: Monday 11/10/2025
Estimated Ship Date: Monday 11/10/2025
Modal Header
Call To Order
This is a custom order part. You can order this part by Contacting Us.
Truck / SUV
Jeep®
Restoration
Stock Replacement
Late Model Muscle
Tools
Gifts, Clothing, & More
Circle Track
Street Rod
Powersports
Paint & Body
Marine
Jr Dragster
